pivotal anchor with snap-in-place insert having rotation blocking extensions
US9980753B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 2011 |
| Grant date | May 29, 2018 |
| Priority date | — |
| Expiry date | Dec 29, 2031 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B17/7076
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A polyaxial bone screw assembly includes a threaded shank body having an integral upper portion receivable in an integral receiver, the receiver having an upper channel for receiving a longitudinal connecting member and a lower cavity cooperating with a lower opening. A friction fit compression insert (some with lock and release feature), a planar split retaining ring and a shank upper portion cooperate to provide for pop- or snap-on assembly of the shank with the receiver either prior to or after implantation of the shank into a vertebra. The shank and receiver once assembled cannot be disassembled and the receiver and insert may include aligned tool receiving apertures for lock and release of the polyaxial mechanism.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.